Changing backup path to a location with existing backups deleted all backups

### Description of issue
Changing the backup path in wp-config.php to a location with existing backups deleted all backups

I was backing up to the default generated path - which I had sym linked to a different directory.

I created a define( 'HMBKP_PATH', '/other2/wordpress_backups' ); entry in wp-config.php, and it deleted all backups in that location which it ahould not have done.